Metallic packing ring



Feb. 14, 1928.

R. A. MUNCH METALLIC PAGKING'RING Filed May'gl, 1921' 3 sheets-sheet 1Feb. 14, 1928.

R. A. MUNCH METALLIC PACKING RING wm IM Feb. 1 4, 192s. l 1,658,935

' R. A. MUNCH METALLIC PACKING RING I Patented Feb. 14, 1928. y

UNITED -sTA ifE-s soenna? A; Menon, or ivin'vwooi), iLLINoIs.

METALLIC frickin/Gaine.

Application filed May 291,

This invention relates to packing for' rods but more particularly pistonrods, valve rods and "the like, and has for its primary' object, tojirovidc ainetallic packing which is more simple anddurable inconstruction and efficient in operationthan devices of a similar natureheretofore known. y. y

Further objects yof the invention yfare to provide increased flexibilityinthe ringl and tl us eliminate breakage, to facilitate the insertion ofthe ring in the stalling box,to insure the proper in itial positioningofthe ring,r withinv the stalling box and subsequent maintenance in thisposition, to providean improved follower for the4 packing ring withinthe stuffing box, to facilitaterefacing of the follower for theA packingring, to provide an improved `ioint between thesegments of the packingiing,'i 1nd inwgeneral to4 pro'- vide an improved rod packing. Y

rl`l1e inanyotherobjects and advantages of 'he invention will be betterunderstood by reference to -lhe following specification when consideredin yconnection with the accom*- panying drawings illustrating certainselected embodiments thereof, in which Fig. 1 is al central sectionalview of an yassenibled rod packing withthe rod in place. Eig. 2 isanenlarge-d end elevation of the i'netallic packing;` ring.

Fig'. 3 is aside elevation partially in section of the ring shown inFig. 2. s

Fig. il is a section on the line 1+i of Fig. 2. n l Y f Fig. 5 is aldetail view showing the pivotal connection between partsA of the ring.

(3 is an end elevation ofa modified forni of .iny packing ring.

Fig'. 7 is a side elevation of the form of ring shown in Fig. 6.

F 8 is an end elevation of another form of my packing ring.

Fig". 9 is an end elevation of anothei` inodilication of my invention.

Fig. 10 is a section on the line 10-10 of Fig'. 9, and

Fig. 11is a detail rearV View of one of the segments of the ring shownin Figs. 1 to 5 inclusive. -v Y Referring,` to the drawings, the pistonrod 9 passes through the usual stuffing,r box 10 in the head of thecylinder. A gland 11 is secured upon the outer face of the stuflinp;boi; by bolts 12 or other suitable means and a tight joint is providedbya gasket 13. A spring` 1d envelops the rod 9fand a preventer gland 11.,forni thefol'lowei': for the packing ring. By 'thus forming the entireforward contacting 192i. semina. 471,411.

15 surrounds this 'sprinm @An inwardly turned flange 15 on thispreventer `abuts'the outer end coil ofthe -spring` 14v and bears againstthe retainer'l closely fittingv about theseginental ring or cup^17 whichforms the'si'pejat for the metallic packing ring 18. `ill segin'entalring 19,*prefera'bly ofbrass or other ``suitable material7 fitsabouttlie rod 9 and abuts, against the rear'face of the packing-"ring"18. This ring 19 presents a wide face of 'continuous metal in contactwith the packing ring` 'and insures adequate and unilits upon thetapered hub 22of the ring 19 and its front race presses against/the rearface 2O fon this ring. The rear facer of the ring 21proje'cts beyond theouter end of the hub 'and ybears against the end 23 of the lhe rings 19and 21 together face of the follower upon a single ringof one kind'ofmetal rather than upon two separate rings generally of different metals,the wear on' the follower is evenly distributechand displacement of thepacking ring produced `or vpermitted by irregularities in the follower,cannot occur.

Furthermore,

the refacing' of the follower is greatly facilitated in such aconstruction.

Thespring 14, 'acting againstthe inner 'wa'lliofthe stuing box.,firmlypresses the conicalend 24 of the packing ring 18 into thecorresponding conical socket 25 in the ring 17 'and prevents leakageabout the rod 9. FA `Lswab holder26 is secureduponjthe oi'iteriend ofthe gland 11 'andswab holder ably formed in segments for piston rods, Ihave found it advisable to use a one-piece ring' for valve rods.

18 shown in detail in FiOs. 2 to 5 inclusive 7 this ring is dividedtransversely into two sec-- tions 29 and 30 practically identical inforni. Each of these sections is further divided into two parts 31 and32 pivotally connected at In the forin of my improved packing` ring formsupport therefor. A'sliding' platefring kthese joints.

der, and the other with a concave end surface adapted to lie over thecorresponding tapered ends of the other segment to form an interlockingjoint between the segments. These ends are rabbeted to form closedjoints at 37 between the opposing ends of the sections. Similarly thepivoted ends of the parts 30 and 3l are preferably rabbeted. The convexinner end faces 38 and 39 on the parts 3l and are preferably formedsubstantially cylindrical with the axis of curvature coincident with theaxis of the pivot pin 33 and the corresponding concave faces 40 and 4:1on the opposite parts tit these faces to permit the parts to swing'about this axis.

rihe rabbeting of the joints between the fai-ions parts of the packingring is advantageous because the pressure exerted by the spring le andthe steam or gases within the cylinder causes the overlapping faces tobind and efectually prevents leakage through The pivotal connection ofparts of the ring facilitates the insertion of thc ring in the stuffingbox and its witln drawal therefrom'and insures the proper positioning ofthe parts within the stuffing boX. By thus pivotally connecting thesegments, it is possible to form tlre ring of a number of short segmentswhich increases the flexibility of the ring and thus eliminates-thebreakage which occurs in rings having long segments.

In Figs. 6 and 7 of the drawings is shown a modified form of rino 4t2having three pivotal joints 43, all and each preferably rabbeted in themanner described in connection with the previous embodiment, and asingle open joint at t6 similar to the joints 37 of the previousembodiment to permit the placing of the ring upon the rod.

In Fig. 8 ofthe drawings is shown a further moditied form of ring 47composed of three parts or sections and the joints L18, 49

and 50 are all of the open or non-connected type. Each of these jointsis preferably rabbeted in the manner described in connection withsimilar joints in the previous embodiments.

In Figs. 9 and 10 is shown a modified 'intense form of packing ringparticularly suitable for use on valve rods where no open joints arenecessary. ln this ring all the joints 5l, 52, and 5a are pivotallyconnected in substantially the same manner as has been described inconnection with similar joints in the previous embodiments. As all thejoints 5l to 54 are preferably the same in form only one will bedescribed in detail. Instead or having the pivot pin in one segmententer a cylindrical perforation in the opposing end of the next segment,this pin enters a slightly elongated or arcuate slot 56 in the nextsegment to permit contraction of the rino* as the rod becomes worn. Thisslot need be only slightly greater in length than the diameter of thepivot pin -as the contraction of the ring will preferably be taken upuniformly by all the joints. In the previous embodiments thiscontraction of the ring was permitted by the open joint or joints sothat no such movement in the pivotal connection was necessary.

It will be readily appreciated that the ring may be provided with anydesired number of segments. Other changes may be made in the form andarrangement of parts Without departing from the spirit of my inventionand I reserve the right to make all such as fairly fall within the scopeof the following claim.v

l claim as my invention:

In a packing ring, a plurality of segments forming in assembly the bodyof the ring,

the ends of certain of said segments being recessed to receive anextension on the end of the segment next adjacent thereto, meanspivotally connecting trie extension within the recess, the end of thesegment having the recess being formed lto be received into a pocketingcavity in the end of the segment having the extension, and said cavityhaving its aXi s perpendicular to said pivoting means thereby to preventdisalignment of the segments circumferentially of the ring and to form atight joint at the hinge connection.

ROBERT A. MUNGH.

